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Original question:

CC2640R2F: How to Read Values from battery monitor

LP-CC2652R7: What is the expected value for current consumption on the GPD switch?

John Junco
Prodigy 10 points
Part Number: LP-CC2652R7
Other Parts Discussed in Thread: CC2652R7, ENERGYTRACE

Tool/software:

Good morning,

I am working with two LP-CC2652R7 boards using the Green Power Device example from the SimpleLink SDK 8.30.01.01. One board runs the gp_switch project, and the other runs gp_sink_light.

I successfully completed the commissioning process between the two devices. Then, I measured the current consumption of the gp_switch device using EnergyTracer (not in debugger mode). However, I am seeing a minimum current draw of around 0.1 mA, which seems too high for a Green Power device.

Setup details:

  • I removed all LaunchPad jumpers except GND, 3.3V, and RESET.

  • I defined the CUI_DISABLE macro in the gp_switch project to disable the UART interface.

  • The device was tested standalone, outside of debug mode.

My questions are:

  1. Is this ~0.1 mA current draw expected for the gp_switch example?

  2. Are there any additional modifications or configurations required to achieve ultra-low power consumption as intended for Green Power devices?

  3. Based on the EnergyTracer results, it seems the device would not be able to operate autonomously for long. Is this normal for this example, or are there further optimizations to apply?

Any guidance or suggestions would be greatly appreciated. I can also provide images from the EnergyTracer output if needed.

Best regards,

1er case: Not sendig GPDFs

2do case: Sending GPDFs

  • 0
    TI__Mastermind 40880 points

    Hi,

    Thank you for reaching out. I have notified the appropriate SW expert and they will respond soon.

    Best Regards,

    Jan

  • 0 in reply to Jan
    TI__Genius 11821 points

    Hello John,

    I hope you are doing well. I took a quick look at the example, and after building/running I do see high average current; though this may be because I need to look deeper into the configuration/settings. 

    We do have some nice documentation in our SDK about GPD:

    Green Power Application Overview — SimpleLinkTm CC13XX/CC26XX SDK Z-Stack User's Guide 8.30.00 documentation

    Thanks,
    Alex F

  • 0 in reply to Jan
    Prodigy 10 points

    ok thanks

  • 0 in reply to Alex Fager
    Prodigy 10 points

    Yes, I’ve reviewed the documentation, but the energy consumption still seems unusually high considering this is a GPD switch (which, unlike an end device, doesn’t poll). I’ve already removed all jumpers — including the ones for the LEDs — and also disabled all LED-related configuration in the firmware, as well as the display. I’ve kept only the button inputs active. Maybe I need some additional configuration as you say, could you give me a hint?

  • 0 in reply to John Junco
    TI__Genius 11821 points

    Hello John,

    If we are talking about just how we usually can reach low power on other projects, what you are doing is correct. I usually remove all jumpers except for the GND and 3.3V, and if the current is still a little high, I might unplug the device and plug it back in to see if that changes anything.

    Thanks,
    Alex F

  • 0 in reply to Alex Fager
    Prodigy 10 points

    Hello Alex,      

    If I've tried unplugging it as well and the results don't change, I'll review the code in more detail to see what's going on. It's worth mentioning that I don't have a "DC power analyzer" right now, so I'm relying on the "Energy Tracer" provided by the launchpad. I will be attentive to advice or suggestions., thanks. :)

  • +1 in reply to John Junco
    TI__Genius 11821 points

    Hello John,

    I took all of the jumpers off on the launchpad, but connected the 10-pin JTAG (xds->launchpad) and got what I think is something closer to the expected value:

    (*Note tested GPD switch on the CC2652R7 on the 8_30_01_01 SDK)

    And on the topic of DC power analyzer we usually only need to use that when we go below 0.7 uA with EnergyTrace.

    Thanks,
    Alex F

  • 0 in reply to Alex Fager
    Prodigy 10 points

    Hi Alex,

    Since I don't have the 10-pin JTAG connector, I tried uninstalling and reinstalling the Code Composer Studio IDE (v12.8.0.00012), keeping only the VCC jumper in place. In some cases, the results are consistent.

    First case: When connecting the LP-CC2652R7 without pressing any button to send a GPDF.

    Second case: I pressed a button to send a GPDF, and after a short delay, I captured the current consumption data using EnergyTrace

    Third case: I pressed a button to send the GPDF and immediately captured the current consumption data using EnergyTrace

    Of course, the GPD light sink receives the data sent by the GPD switch. I believe the false readings could be due to noise or some other factor. In any case, I would need to get a 10-pin connector to replicate your results, or use a shunt resistor and measure it with an oscilloscope. In summary, it's clear to me how low the device's power consumption can be.

    Thanks, 

    Jhon

  • 0 in reply to John Junco
    TI__Guru**** 214397 points

    Hi John,

    Here is an Application Report for Zigbee Power Consumption including GPD, in case you were not already aware of it: https://www.ti.com/lit/an/swra625/swra625.pdf 

    Regards,
    Ryan